References
- Guo , Y. Q. 1996 . Structure of the weakly left C-semigroups . Chin. Sci. Bull. , 41 ( 6 ) : 462 – 467 .
- Yamada , M. 1973 . Orthodox semigroups whose idempotents satisfy a certain identity . Semigroup Forum , 6 : 113 – 128 .
- Zhu , P. Y. , Guo , Y. Q. and Shum , K. P. 1992 . Structure and characteristics of left Clifford semigroups . Sci. China, Series A , 35 ( 7 ) : 791 – 805 .
- #Communicated by D. Easdown.